i have an issue in indexing mt site to webmaster, but it is indexed and the comment is showing indexed but not submitted to sitemap, what does it mean

Every user-facing the same issues but I would like to suggest some tips that you must check: Did you follow the Google guidelines and the major facts like: 1. Robots.txt 2. URLs contain excluded parameters 3. Content Quality, and check the duplicate content. 4. Check the Robots meta tag-no index, no follow.